The two breather hoses go from the valve covers to a port by the throttle body. Clean them out or replace them and see if the problem goes away. Devildub is on the right track to solving it or confirming that the seals are bad.

 

I have already replaced the hoses coming from the valve covers..non of the parts that they connect to. was going to try to clean with heavy solvant or sea foam but do not want it to lead to the crank case with out knowing it (so I can change the oil right away). I may just remove the hoses and make a 'ghetto breather' using foam or something that will let it out the pressure but not the oil...did this on all my old Z-cars (straight 6) Temp to see if the leak goes away of course!